在vue使用MQTT

最近有个需求，需要前端直接链接mqtt，想到后面可能多出使用，就封装成了hooks

中间遇到了一个坑，就是浏览器默认不支持mqtt协议，其借助了webSocket实现的mqtt协议， 而mqtt默认未开启webSocket官网中并说明，但其demo中都是使用的ws，最后通过不断的摸索确认是 需要在配置中进行相关配置

安装mqtt插件

pnpm add mqtt

or

npm i mqtt

or

yarn add mqtt

导入mqtt

import * as mqtt from "mqtt/dist/mqtt.min"

封装

这个封装只需要稍加改动就能在react中使用

import * as mqtt from "mqtt/dist/mqtt.min";
import {onUnmounted, reactive, ref} from "vue";

export default function useMqtt(options, getMessage) {
    const data = ref();
    const connection = reactive({
        protocol: options.host ?? 'ws',
        host: options.host ?? '81.69.203.93',
        port: options.port ?? 8083,
        clientId: options.clientId ?? "mqttx_" + Math.random().toString(16).substring(2, 8),
        username: options.username ?? 'bduser',
        password: options.password ?? '123456',
        clean: options.clean ?? true,
        connectTimeout: options.connectTimeout ?? 30 * 1000, // ms
        reconnectPeriod: options.reconnectPeriod ?? 4000 // ms
    });
    /**
     * 订阅信息设置
     */
    const subscription = ref({
        topic: options.subscription.topic, //需要动态配置
        qos: options.subscription.qos
    });
    let client = ref({
        connected: false
    });
    const receivedMessages = ref("");
    const subscribedSuccess = ref(false);
    const btnLoadingType = ref("");
    const retryTimes = ref(0);
    /**
     * 初始化
     */
    const initData = () => {
        client.value = {
            connected: false
        };
        retryTimes.value = 0;
        btnLoadingType.value = "";
        subscribedSuccess.value = false;
    };
    const handleOnReConnect = () => {
        console.log(`第${retryTimes.value}次重试`);
        retryTimes.value += 1;
        if (retryTimes.value > 5) {
            try {
                client.value.end();
                initData();
            } catch (error) {
                console.error(error)
            }
        }
    };
    /**
     * 创建连接
     */
    const createConnection = () => {
        try {
            btnLoadingType.value = "connect";
            console.log('connection----->', connection)
            const {protocol, host, port, ...options} = connection;
            const connectUrl = `${protocol}://${host}:${port}/mqtt`;
            client.value = mqtt.connect(connectUrl, options);
            if (client.value.on) {
                client.value.on("connect", () => {
                    btnLoadingType.value = "";
                    console.log("------链接建立成功------");
                });
                client.value.on("reconnect", handleOnReConnect);
                client.value.on("error", (error) => {
                    console.error("------链接建立失败------", error)
                });
                client.value.on("message", (topic, message) => {
                    receivedMessages.value = receivedMessages.value.concat(message.toString());
                    data.value = JSON.parse(message);
                    if (getMessage) getMessage(message);
                    console.log("收到的数据--------------", data.value);
                });
            }
        } catch (error) {
            btnLoadingType.value = "";
            console.error("链接出错", error);
        }
    };
    /**
     * 订阅消息
     */
    const doSubscribe = () => {
        btnLoadingType.value = "subscribe";
        const {topic, qos} = subscription.value;
        console.log("订阅消息------->", `$queue${topic}`, qos);
        client.value.subscribe(`$queue${topic}`, {qos}, (error, granted) => {
            btnLoadingType.value = "";
            if (error) {
                console.log("subscribe error:", error);
                return;
            }
            subscribedSuccess.value = true;
            console.log("subscribe successfully:", granted);
        });
    };
    /**
     * 关闭连接
     */
    const destroyConnection = () => {
        if (client.value.connected) {
            btnLoadingType.value = "disconnect";
            try {
                client.value.end(false, () => {
                    initData();
                    console.log("disconnected successfully");
                });
            } catch (error) {
                btnLoadingType.value = "";
                console.log("disconnect error:", error);
            }
        }
    };
    /**
     * 发送消息
     * @param data
     */
    const publishMessage = (data) => {
        btnLoadingType.value = "publish";
        const {topic, qos} = subscription.value
        console.log(`发送消息到【${topic}】-【${qos}】`)
        client.value.publish(`${topic}`, data, {qos}, (error) => {
            btnLoadingType.value = "";
            if (error) {
                console.error("消息发送失败", error);
                return;
            }
            console.log(`消息内容${data}`);
        });
    };

    /**
     * 取消订阅
     */
    const doUnSubscribe = () => {
        btnLoadingType.value = "unsubscribe";
        const {topic, qos} = subscription.value;
        console.warn("取消订阅------->", `$queue${topic}`, qos);
        client.value.unsubscribe(`$queue${topic}`, {qos}, (error) => {
            btnLoadingType.value = "";
            subscribedSuccess.value = false;
            if (error) {
                console.log("unsubscribe error:", error);
                return;
            }
            console.log(`unsubscribed topic: ${topic}`);
        });
    };
    /**
     * 创建连接并订阅
     */
    const createAndDo = () => {
        createConnection();
        doSubscribe();
    }
    // //组件销毁前断开连接
    onUnmounted(() => {
        console.log("------页面销毁前断开连接------");
        destroyConnection();
    });
    return {
        data,
        publishMessage,
        connection,
        subscription,
        doUnSubscribe,
        destroyConnection,
        createConnection,
        doSubscribe,
        createAndDo
    };
}